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Turbine ventilator are ventilation system which used especially in industries, warehouses, workshops, and even households. This equipment serves to suck the air in a room and then be discharged into the atmosphere. The equipment does not require electrical energy, only with the gusts of wind from outside the building, the equipment was functioning properly. This study intended to assess the performance of turbine ventilator with additional duct modifications of turbine ventilator.
This research was conducted experimentally on 300 mm diameter of turbine ventilator. Turbine ventilator were tested in wind tunnel and conducted by varying effects of opening angle of the hood. Freestream induced to turbine ventilators based on Reynolds numbers of 56.000, 93.000, 130.000, and 170.000. The measured variable is pressure difference at the duct of turbine ventilators, turbine ventilators angular velocity, and the power that generated by the turbine ventilator. the pressure difference is measured using pitot static tube, ventilator turbine rotation is measured by using tachometer, and torque is measured by measuring the charge in the DC generator circuit.
The result show that the rotation of turbine ventilator will increase as long as the opening angle of hood is rising at the same reynold number. In other hand, the suction pressure, flowrate, power and efficiency of vent turbin also increasing with the rising of opening angle of hood at the same reynolds number.

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